<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="addFn">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in arr" :key="index">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click="delbtn(item.id)">删除</button>
            <button @click="editbtn(item.id)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      name: '',
      age: '',
      sex: '男',
      flag: '',
      arr: JSON.parse(localStorage.getItem('arr')) || [],
    }
  },
  methods: {
    addFn() {
      if (this.name.trim().length === 0 && this.age.trim().length === 0) {
        return alert('请输入正确的信息')
      }
      if (this.flag === '') {
        this.arr.push({
          id: +new Date(),
          name: this.name,
          age: this.age,
          sex: this.sex,
        })
      } else {
        this.flag.name = this.name
        this.flag.age = this.age
        this.flag.sex = this.sex
      }

      this.name = ''
      this.age = ''
      this.sex = '男'

      // 重置flag
      this.flag = ''
    },
    delbtn(id) {
      this.arr = this.arr.filter((item) => item.id !== id)
    },
    editbtn(id) {
      this.flag = this.arr.find((item) => item.id === id)
      this.name = this.flag.name
      this.age = this.flag.age
      this.sex = this.flag.sex
    },
  },
  watch: {
    list: {
      deep: true,
      immediate: true,
      handler() {
        localStorage.setItem('arr', JSON.stringify(this.arr))
      },
    },
  },
}
</script>
